Products / Height Data

Height Data

Photogrammetric Digital Terrain Models (DTM) and Digital Surface Models (DSM) are available nationwide in a variety of formats to suit your application. Created photogrammetrically from our high-resolution aerial photography, our DSM provides a 1m grid of heights that includes surface features such as buildings and trees, whilst our DTM provides a bare earth model on a 5m grid and is available on a 2m grid in some areas.

Products available:

25cm Photogrammetric DSM

DSM (Digital Surface Models) The Earth’s surface including buildings and vegetation, with a 25-centimetre grid spacing.

Resolution: 25cm

Accuracy XY: ± Up to 1m rmse

Accuracy Z: ± Up to 1.5m rmse

Projection: ITM95

1m Photogrammetric DSM

DSM (Digital Surface Models) The Earth’s surface including buildings and vegetation, with a 1-metre grid spacing.

Resolution: 1m

Accuracy XY: ± Up to 1m rmse

Accuracy Z: ± Up to 1.5m rmse

Projection: ITM95

2m Photogrammetric DTM

DTM (Digital Terrain Models) The Earth’s terrain excluding buildings and vegetation, with a 2-metre grid spacing.

Resolution: 2m

Accuracy XY: ± Up to 1m rmse

Accuracy Z: ± Up to 1.5m rmse

Projection: ITM95

5m Photogrammetric DTM

DTM (Digital Terrain Models) The Earth’s terrain excluding buildings and vegetation, with a 5-metre grid spacing.

Resolution: 5m

Accuracy XY: ± Up to 1m rmse

Accuracy Z: ± Up to 1.5m rmse

Projection: ITM95

2m Contours

Contours are lines connecting location of equal elevation. In areas with little change in elevation the lines will be far apart, moving closer together in an area of steeply sloping terrain. Supplied as an ESRI Shapefile, polylines at 2m elevation intervals. Derived from Bluesky's 5m Digital Terrain Model.

25m Photogrammetric DTM

DTM (Digital Terrain Models) 'bare earth' terrain model of the Republic of Ireland with a 25-metre grid spacing.

Resolution: 25m

Accuracy XY: ± Up to 3.0m RMSE

Accuracy Z: ± Up to 3.0m RMSE

Projection: ITM95

Bluesky are offering this product Free of Charge.